Portable musical instrument amplifier with a movable plug



FIG. 1 is a top, side and end perspective view of a portable musical instrument amplifier with a movable plug showing my new design;

FIG. 2 is a side elevational view thereof, the undisclosed opposite side being a mirror image;

FIG. 3 is an end view with the plug shown in an alternate position thereof;

FIG. 4 is a side elevational view of FIG. 3, the undisclosed opposite side being a mirror image;

FIG. 5 is an end view of FIG. 3;

FIG. 6 is a top plan view of FIG. 3; and,

FIG. 7 is a bottom plan view of FIG. 3, the fragmentary portion of the plug is shown for clarity of illustration. 

The ornamental design for a portable musical instrument amplifier with a movable plug, as shown and described. 